Practice questions based on chapter 7( light ) for class 9

 1. Pushkar is running towards a plane mirror at the rate of 3ms-¹. With what speed is he approaching his own image?

2. Magnification of a convex mirror is 0.5 when an object is placed at a distance of 0.6m from it. Where should the object be placed, so that the size of the image becomes 1/3 of that of the object?

3. An object is kept at a distance of 14 cm from a concave mirror whose radius of curvature is 28 cm. What is the position of the image?

4. If an object is placed at a distance of 10 cm from a concave mirror of focal length 20cm discuss the nature of the image formed by drawing the ray diagram.

5. An object is placed at a distance of 5cm from a spherical mirror and the image is formed at a distance of 15 cm from the mirror on the same side as the object. Find nature and the focal length of the mirror?

6. At what distance from a concave mirror of focal length 15cm should an object be placed , so that its image is formed 30 cm from the mirror?

7. What what should be the position of an image when an object is placed at a distance of 20cm from a concave mirror of focal length of 20cm?

8. Establish the relationship between magnification and focal length by using the mirror formula.

9. An object 2 cm high is kept at a distance of 15 cm from a concave mirror which produces a real image 3cm high. Then find the following:

A. Focal length of the mirror

B. Position of the image

10. Prithvi is standing in front of a plane mirror at a distance of 3 m from it. If the the boy moves 1 m backward, the distance between the image and Prithvi will be ?

11. A plane mirror is approaching you at 15 cm per second. You can see your image in it. At what speed will you image approach you?

12. A plane mirror reflecting A Ray of incident light is rotated through an angle 5° about an Axis through the point of incidence in the Plane of the mirror and perpendicular to the plane of incidence, then find the angle by which the reflected ray rotates through?

13. A Ray of light incident on the first mirror and parallel to the second is reflected from the second mirror parallel to first mirror. Find the angle between the Mirrors?

14.two mirrors are inclined at a certain angle to each other.explain the formation of image with a suitable example.

15.